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Based on the Boit theory of acoustic wave propagation in fluid-satu-rated porous medium we have studied in this paper the acoustic reflection andtransmission on multilayered porous media,in which the adequate boundaryconditions across the interfaces are taken into account.Numerical calculationsof the reflection and transmission coefficients at different incident angles andfrequencies of the fast compressional wave incident on porous media with threeor four layers are presented.The results indicate that the maximum or mini-mum reflection and transmission coefficients appear at certain ratios of thewavelength to the thickness.The acoustic incident angle and porous mediumproperties are shown to affect significantly these coefficients.As an example,the measured transmission coefficients in a water-saturated fused glass beadsample are in good agreement with theoretical prediction.
Based on the Boit theory of acoustic wave propagation in fluid-satu-rated porous medium we have studied in this paper the acoustic reflection and transmission on multilayered porous media, in which the adequate boundary conditions across the interfaces are taken into account. Numerical calculations of the reflection and transmission coefficients at different incident angles and frequencies of the fast compressional wave incident on porous media with three or four layers are presented. The results that maximum that mini or mum reflection and transmission coefficients appear at certain ratios of the wave length to the thickness. angle and porous mediumproperties are shown to affect significantly these coefficients. As an example, the measured transmission coefficients in a water-saturated fused glass beads sample are in good agreement with theoretical prediction.